US3383898A - Continuous rolling mill - Google Patents

Continuous rolling mill Download PDF

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Publication number
US3383898A
US3383898A US624955A US62495567A US3383898A US 3383898 A US3383898 A US 3383898A US 624955 A US624955 A US 624955A US 62495567 A US62495567 A US 62495567A US 3383898 A US3383898 A US 3383898A
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United States
Prior art keywords
gears
shaft
stands
gear
rolling mill
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Expired - Lifetime
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US624955A
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English (en)
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Properzi Ilario
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills

Definitions

  • ABSTRACT OF THE DISCLOSURE A rolling mill assembly is disclosed, in which all idle gears have been dispensed with for transferring the motive force, thus affording the advantage of having gears of a larger diameter than in the prior art mills and of transmitting thereby larger amounts of motive power than heretofore practicable.
  • This invention relates to a continuous rolling mill, and more particularly to a train of rolls for metal rods and wires.
  • rolling mills for rods and wires which comprise a sequential array of adjacent rolling stands which contain the individual rollers, the individual stands being driven by shafts (one for each stand) arranged in alternation and at even distances above and below the rolling line and rotating in alternately inverted directions.
  • shafts one for each stand
  • the transfer of the drive from one of said shafts to the preceding or the next shaft is effected by inserting idle gears which engage spur gears keyed onto said shafts: the shafts are driven by a motor through a plurality of parallel axles carrying beveled gears which act on as many discrete gears fixed to said shafts.
  • the idle and active gears are rotated at a low surface speed on account of their small diameter, and are enabled to transfer small amounts of power only.
  • the teeth of the idle and active gears should have a diametral pitch corresponding to the gear diameters, and thus are, of necessity, of reduced size, this fact being an additional reason why high stresses cannot be transferred from a gear to another gear coming in engagement there-with.
  • An objective of the present invention is to overcome the drawbacks enumerated above, to provide a train of rollers for metal rods and wires (wherein a large number of roller stands is employed) which is capable of trans ferring powers over 1,000 HP and, more precisely, in the order of magnitude of 2,000 HP.
  • Another object is to provide a train of rollers which is adapted to be cheaply constructed and requires only a quick and convenient setting operation.
  • a train of rollers comprising a driving motor and a plurality of sequentially arranged roller stands in which every one of said stands receives its drive from a single shaft and in which said shafts are arranged alternately at equal and opposite distances with respect to the rolling line, said train being characterized in that on said individual shaft of at .least each of the two end roller stands of said set of roller stand is keyed a single gear and that on said single shaft of the other stands is keyed a pair of gears of different diameters, one of the gears of said pair of gears of a shaft being in engagement with a gear of the next shaft, the other gear of said pair of gears of said shaft being in engagement with a gear of the shaft which immediately precedes said first named shaft, the gears being such that the roller stands have continuously increasing speeds in the direction of rolling, the motor shaft being connected to an axle which also has a pair of gears, one of said gears meshing with a gear of one of said shaft next thereto and the other gear
  • FIG. 1 is a front view of said train of rollers.
  • FIG. 2 is a partial plan view of said train of rollers
  • FIG. 3 shows a cross-sectional view of said train of rollers, taken along the line Ill-III of FIG. 2.
  • said train of rollers comprises a driving motor 1, equipped with a fan 2 for cooling it, and a plurality of sequentially arranged roller stands 3, which are akin to stands known in the art and whose detailed description is omitted, each of said stands receives the drive through a joint 11 from a single shaft 4, the individual single shafts of each stand being arranged in alternation and equally spaced apart :but on opposite sides of the rolling lines.
  • a single spur gear To each single shaft 4 of each of the two end stands of rollers is keyed a single spur gear, whereas to said single shaft 4 of the other stands of said plurality of stands is keyed a pair of spur gears 5 and 6 having different diameters.
  • One of the gears of said pair of gears of each single shaft meshes with a gear of the pair of gears keyed to the next shaft downstream of said single shaft, whereas the other gear of said pair of gears of said single shaft is in engagement with a gear of the pair of gears keyed to the next preceding shaft.
  • the gears are such that the stands have speeds which continuously increase along the direction of rolling. This occurs because the cross-sectional area of the roller bar is decreased during progress of rolling so that the RPM of the roller stands should be increased so as to keep the rate of flow in the unit time, that is the volume of metal processed through each stand, a constant.
  • the motor 1 is connected, by a joint 7, to an axle 8, placed in correspondence with the shaft 4 of one of the stands 3 and below it, two gears 9 and 10 being keyed to said shaft 4.
  • One of said gears 9 and It) is in engagement with a gear of the pair of gears keyed to the shaft which is adjacent to and precedes the shaft placed above said axle 8, while the other of said gears 9 and 10 is in mesh with a gear of the pair of gears of the shaft adjacent and following the shaft placed above said axle 8.
  • To the shaft placed above the axle 8 is keyed one gear only, this being in engagement with the other gear of the pair of gears of the shaft which is adjacent and on the left as viewed in FIG. 2, with respect to the shaft placed above the axle 8.
  • the axle 3 is positioned in correspondence with the shaft of any stand of the plurality of stands 3, providing that said stand is not one of the end stands.
  • the stands 3 are assembled in a unit 12 and the shafts 4 with their gears 5 and 6 are assembled in a block 13, said blocks 12 and 13 being borne by a single bedplate 14.
  • the block 12 has a perforation 15 through which the rod to be rolled enters or a rolled bar is delivered. If the axle of the motor 1 is rotated in the clockwise direction, the shafts 4 of the stands 3 are rotated in alternately reversed direction as shown by the arrows of PEG. 3 and the rod to be rolled enter-s through the hole 16 (FIG. 2), passes through the subsequent stands 3 and is then delivered, as rolled, from the hole 15. As shown in FIG. 2, all the gears are arranged on three parallel vertical planes.
  • a primary advantage which is obtained with the inventive rolling mill as compared with any conventional mill is to have done away with the idle gears. Since there is now more room available, the gears keyed to the single shafts 4 of the stands 3 can be made of a diameter larger than before, so that much more power is transferred than heretofer practicable with the conventional trains of rollers. As a matter of fact, the greater is the diameter of the gears, the greater is the surface speed thereof and consequently the transferred power is increased.
  • the teeth can also be made thicker, which permit a further increase of the transferred power.
  • the number of necessary gears is reduced, so that a safer operation is obtained together with an easier setting: in fact, if a great number of gears is involved, it is difficult to obtain that all of them may mesh perfectly.
  • elimination of the idle gears results in a considerable reduction of the initial cost of the rolling mill.
  • a further advantage is that only cylindrical gears are used, both spur gears and helical tooth gears which can be ground and replaced at a low cost. Thus, if a gear is broken, it is removed from its shaft and honed and, if the defect is serious, it is replaced without disturbing the train of rollers.
  • a rolling mill comprising, in combination, a plurality of consecutively arranged roll stands comprising each a -riven roll mounted on a single driven shaft and an idler roll, the driven shafts of successive stands being arranged parallel to each other and respectively to opposite sides of the rolling plane equally spaced therefrom; a single drive motor having a drive shaft parallel to said driven shafts and arranged intermediate the stands at opposite ends of said rolling mill; at first gear train for transmitting a drive from said drive shaft to the driven shafts on stands between said drive shaft and one end of said rolling mill; and a second gear train for transmitting a drive from said drive shaft to the driven shafts on the stands between said drive shaft and the other end of said rolling mill, each of said gear trains including successive pairs of meshing gears arranged alternately on opposite sides of said rolling plane mounted on said driven shafts of successive driven rolls and the gears of said first and said second gear train being constituted exclusively by gears respectively fixed to said drive shaft and said driven shafts for rotation therewith.
  • gear trains comprise a single gear fixed to the driven shafts of the stands at opposite ends of the rolling mill and to the driven shaft on a further stand intermediate said opposite ends, a pair of gears fixed to each driven shaft of the remainder of said plurality of stands, a pair of gears fixed to said drive shaft, one meshing with one gear on the shaft of the stand preceding said further stand and the other meshing with one gear on the shaft of the stand following said further stand, and each of the pair of gears on the driven shafts of one stand, with the exception of said one gear on the shaft of the stand following said further stand, meshing with a corresponding gear on driven shafts of stands respectively immediately preceding and following said one stand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US624955A 1960-08-01 1967-03-21 Continuous rolling mill Expired - Lifetime US3383898A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1357460 1960-08-01
IT699766 1966-03-26

Publications (1)

Publication Number Publication Date
US3383898A true US3383898A (en) 1968-05-21

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US624955A Expired - Lifetime US3383898A (en) 1960-08-01 1967-03-21 Continuous rolling mill

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US (1) US3383898A (zh)
BE (1) BE696093A (zh)
CH (1) CH445417A (zh)
FR (2) FR1296403A (zh)
GB (2) GB975510A (zh)
SE (1) SE346708B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083217A (en) * 1977-03-07 1978-04-11 F. J. Littell Machine Company Overlapping gear drive for straightening machines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5152165A (en) * 1991-07-11 1992-10-06 Morgan Construction Company Rolling mill
DE102013002552B3 (de) * 2013-02-15 2014-06-12 Thielenhaus Technologies Gmbh Verteilergetriebe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1379181A (en) * 1921-05-24 Wire-drawing machine
US2789450A (en) * 1953-02-05 1957-04-23 Properzi Ilario Rolling mill
US3299685A (en) * 1963-03-26 1967-01-24 Kocks Gmbh Friedrich Drive for a multiple-stand rolling mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1379181A (en) * 1921-05-24 Wire-drawing machine
US2789450A (en) * 1953-02-05 1957-04-23 Properzi Ilario Rolling mill
US3299685A (en) * 1963-03-26 1967-01-24 Kocks Gmbh Friedrich Drive for a multiple-stand rolling mill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083217A (en) * 1977-03-07 1978-04-11 F. J. Littell Machine Company Overlapping gear drive for straightening machines

Also Published As

Publication number Publication date
GB975510A (en) 1964-11-18
BE696093A (zh) 1967-09-01
CH445417A (it) 1967-10-31
FR1296403A (fr) 1962-06-15
SE346708B (zh) 1972-07-17
FR1516681A (fr) 1968-03-08
GB1134292A (en) 1968-11-20

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